Preamble, NOT a part of the Constitution

"We, the sovereign Filipino people, imploring the aid of Almighty God, in order to build a just and humane society, and establish a Government that shall embody our ideals and aspirations, promote the common good, conserve and develop our patrimony, and secure to ourselves and our posterity, the blessings of independence and democracy under the rule of law and a regime of truth, justice, freedom, love, equality, and peace, do ordain and promulgate this Constitution."
Jurisprudence educates that a preamble is not an essential part of an act as it is an introductory or preparatory clause that explains the reasons for the enactment, usually introduced by the word "whereas." (G.R. No. 206666; January 21, 2015)

Besides, a preamble is really not an integral part of a law. It is merely an introduction to show its intent or purposes. It cannot be the origin of rights and obligations. Where the meaning of a statute is clear and unambiguous, the preamble can neither expand nor restrict its operation, much less prevail over its text. In this case, it cannot be the authoritative source to show compliance with the Constitution. (G.R. No. 132601; January 19, 1999)